... range of forms including nut, screw, ring, wire, foil, sheet, rod, tube tungsten copper alloy sheetApplications: * For producing electric light source ... 95%,99.99% and 9.999%Standard: ASTM B760 or GB3875-83 ASTM B760 as follows:Chemical composition elementMax ToleranceC0 ... forms including nut, screw ,ring ,wire, foil, sheet, rod, strip, plate, tube, alloys according to Standard ASTM AMS ASME MIL DMS ...